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                [Sdoi2013]森林                </h1>
                <p>时间限制：20s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：512MB</p>			</div>
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                                <h3>题目描述</h3><p><p><img height="393" alt="" width="787" src="../file/3123_0.jpg" /></p>
<p></p></p><hr/><h3>输入格式</h3><p><p><span style="font-size: medium">第一行包含一个正整数testcase，表示当前测试数据的测试点编号。保证1&le;testcase&le;20。 <br />
第二行包含三个整数N，M，T，分别表示节点数、初始边数、操作数。第三行包含N个非负整数表示&nbsp;N个节点上的权值。 <br />
&nbsp;接下来&nbsp;M行，每行包含两个整数x和&nbsp;y，表示初始的时候，点x和点y&nbsp;之间有一条无向边, 接下来&nbsp;T行，每行描述一个操作，格式为&ldquo;Q x y k&rdquo;或者&ldquo;L x y&nbsp;&rdquo;，其含义见题目描述部分。</span></p></p><hr/><h3>输出格式</h3><p><p><span style="font-size: medium">对于每一个第一类操作，输出一个非负整数表示答案。&nbsp;<br />
&nbsp;<br />
&nbsp;</span></p></p><hr/><h3>样例输入</h3><pre>1 
8  4 8
1  1 2 2 3 3 4 4
4  7
1  8
2  4
2  1
Q 8 7 3 Q 3 5 1 
Q 10 0 0 
L 5 4 
L 3 2 L 0 7 
Q 9 2 5 Q 6 1 6 
 
 </pre><hr/><h3>样例输出</h3><pre>2 
2
1
4
2 </pre><hr/><h3>提示</h3><p><p><span style="font-size: medium"><br />
对于第一个操作 Q 8 7 3，此时&nbsp;lastans=0，所以真实操作为Q 8^0 7^0 3^0，也即Q 8 7 3。点8到点7的路径上一共有5个点，其权值为4 1 1 2 4。这些权值中，第三小的为&nbsp;2，输出&nbsp;2，lastans变为2。对于第二个操作 Q 3 5 1&nbsp;，此时lastans=2，所以真实操作为Q 3^2 5^2 1^2&nbsp;，也即Q 1 7 3。点1到点7的路径上一共有4个点，其权值为&nbsp;1 1 2 4&nbsp;。这些权值中，第三小的为2，输出2，lastans变为&nbsp;2。之后的操作类似。&nbsp;<br />
&nbsp;<br />
<img height="681" alt="" width="696" src="../file/3123_0.jpg" /></span></p></p><hr/><h3>题目来源</h3><p>没有写明来源</p>
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